tldr/pages/common/egrep.md

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# egrep
> Find patterns in files using extended regular expression (supports `?`, `+`, `{}`, `()` and `|`).
> More information: <https://manned.org/egrep>.
- Search for a pattern within a file:
`egrep "{{search_pattern}}" {{path/to/file}}`
- Search for a pattern within multiple files:
`egrep "{{search_pattern}}" {{path/to/file1 path/to/file2 ...}}`
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- Search `stdin` for a pattern:
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`cat {{path/to/file}} | egrep {{search_pattern}}`
- Print file name and line number for each match:
`egrep --with-filename --line-number "{{search_pattern}}" {{path/to/file}}`
- Search for a pattern in all files recursively in a directory, ignoring binary files:
`egrep --recursive --binary-files={{without-match}} "{{search_pattern}}" {{path/to/directory}}`
- Search for lines that do not match a pattern:
`egrep --invert-match "{{search_pattern}}" {{path/to/file}}`